Income Effect
Income Effect
Income Effect
• In microeconomics, the income effect is the change in demand for a good or service caused by a
change in a consumer's purchasing power resulting from a change in real income. This change can
be the result of a rise in wages etc or because existing income is freed up by a decrease or increase
in the price of a good that money is being spent on.
• The income effect describes how the change in the price of a good can change the quantity that
consumers will demand of that good and related goods, based on how the price change affects
their real income. The change in the quantity demanded resulting from a change in price of a good
can vary depending on the interaction of the income and substitution effects. For inferior goods,
the income effect dominates the substitution effect and leads consumers to purchase more of a
good, and less of substitute goods, when the price rises.
• Income effect refers to the change in the demand for a good as a result of a change in the income
of a consumer. It is important to note that we are only concerned with relative income, i.e., income
in terms of market prices.
• The income effect is the change in the consumption of goods based on income. This means
consumers will generally spend more if they experience an increase in income, and they may
spend less if their income drops. But the effect doesn't dictate what kind of goods consumers will
buy. They may opt to purchase more expensive goods in lesser quantities or cheaper goods in
higher quantities, depending on their circumstances and preferences.
• As we can see from the graph above – the initial starting point is at Point A where disposable income is on the
grey line (DC1). At this point, the demand for Good Y is Y1 and Good X in Q1. When the price of Good X
decreases, it has a substitute effect. In other words, customers who used to buy Good Y will buy more of
Good X as a result. This is demonstrated at point C. So the difference between Q1 and Q3 is known as the
substitute effect.
• The income effect is the boost in the quantity that is achieved as a result of consumers having a greater
quantity of disposable income – which is demonstrated by the difference between point C and point B.